OPK question!

When you get your positive and then it fades you are officially ovulating? Does this make sense? Like I test twice a day when testing and last night a positive and this morning still a positive so does that mean I still have not 12-24 as of this morning before an egg releases? And once my test goes back negative I am releasing an egg?

Husband is trying to join army and was not home when I got positive so we are going to try tonight..